Question

A direct variation function contains the points (2, 14) and (4, 28). Which equation represents the function?

Answer 1

A direct variation has a constant slope, i.e. (y/x)= constant.

Both of the given two points give a slope of (y/x)=14/2=28/4=7, so the equation of the function is
y/x=7, or simply
y=7x